Australian Hussey, aged 27, who plays for Victoria, has made a major impact in his first year in county cricket and is currently the only Notts batsman to have scored more than 1,000 Championship runs.
Said Hussey: "I have thoroughly enjoyed my first season at Trent Bridge. The team has enjoyed success with promotion in the Frizzell County Championship and we hope to gain promotion in the totesport League with a win at Taunton on Wednesday.
"The opportunity to play in Division One next summer is very exciting and I hope to make a major contribution to the team's challenge in all competitions.
"The players, staff and supporters at Trent Bridge have made me feel very welcome in my first season.
"This team has masses of potential. I've enjoyed being part of it and I am delighted to have been offered the chance to play for another two years at Trent Bridge."
Director of Cricket Mick Newell said: "David has enjoyed an excellent first season at Trent Bridge scoring five first class centuries on his way to passing 1,000 runs.
"We took a gamble on him this summer because although he came highly recommended we had not actually seen him play.
"But he's our leading scorer, has been a superb character in the dressing room and his desire to do well for Notts is clear for all to see."
The news is another major boost to Notts and comes just 48 hours after signing England Academy off-spinner Graeme Swann on a three year deal.
THURSDAY 21 SEPTEMBER 2017
ENGLAND v WEST INDIES